Verify the inputs
Measure or document each input. If a value is only an estimate, record its source and test a conservative alternative.
Water treatment/ CALCULATOR
Water-softener regeneration and salt estimate
Relate hardness load, daily treated volume and usable exchange capacity to an estimated regeneration interval.
FROM ESTIMATE TO ACTION
Use the result, not just the number.
Keep the calculation traceable
Save the input link or copied result together with the date, units and assumptions. A number without its inputs cannot be checked later.
Confirm the decision
Compare the estimate with the related guide, current product data and requirements that apply at your location before buying or building.
Inputs to verify
- Feed-water hardness as CaCO₃ (mg/L)
- Use a representative laboratory or validated field result expressed as mg/L as calcium carbonate.
- Daily softened-water use (L/day)
- Exclude water intentionally bypassed around the softener.
- Rated working capacity at chosen salt dose (kg as CaCO₃)
- Use the manufacturer capacity for the programmed salt setting, not a maximum marketing figure.
- Capacity reserve (%)
- Capacity intentionally held back for variable demand and measurement uncertainty.
- Salt used per regeneration (kg/cycle)
- Use the programmed salt dose or a measured refill history.
- Water used per regeneration (L/cycle)
- Use the equipment rating for the actual cycle and settings.